package com.wk.banner.websocket;

import java.io.IOException;
import java.util.concurrent.ConcurrentHashMap;


import javax.websocket.OnClose;
import javax.websocket.OnError;
import javax.websocket.OnMessage;
import javax.websocket.OnOpen;
import javax.websocket.Session;
import javax.websocket.server.PathParam;
import javax.websocket.server.ServerEndpoint;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;


@ServerEndpoint(value="/websocket/{userId}")
@Component
public class WebSocketServer {
	private static Logger log = LoggerFactory.getLogger(WebSocketServer.class);
	 //静态变量，用来记录当前在线连接数。应该把它设计成线程安全的。
    private static int onlineCount = 0;
    //concurrent包的线程安全Set，用来存放每个客户端对应的MyWebSocket对象。
   // private static CopyOnWriteArraySet<WebSocketServer> webSocketSet = new CopyOnWriteArraySet<WebSocketServer>();
    private static ConcurrentHashMap<String, WebSocketServer> webSocketMap = new ConcurrentHashMap<>();
    //与某个客户端的连接会话，需要通过它来给客户端发送数据
    private Session session;
 
    private String userId;
    /**
     * 连接建立成功调用的方法*/
    @OnOpen
    public void onOpen(Session session,@PathParam("userId") String userId) {
        this.session = session;
//        webSocketSet.add(this);     //加入set中
        webSocketMap.put(userId, this);
        addOnlineCount();           //在线数加1
        log.info("有新连接加入！当前在线人数为" + getOnlineCount());
        this.userId = userId;
        try {
        	 sendMessage("连接成功");
        } catch (IOException e) {
            log.error("websocket IO异常");
        }
    }
	//	//连接打开时执行
	//	@OnOpen
	//	public void onOpen(@PathParam("user") String user, Session session) {
	//		currentUser = user;
	//		System.out.println("Connected ... " + session.getId());
	//	}
 
    /**
     * 连接关闭调用的方法
     */
    @OnClose
    public void onClose() {
        // webSocketSet.remove(this);  //从set中删除
    	webSocketMap.remove(this.userId);
        subOnlineCount();           //在线数减1
        log.info("有一连接关闭！当前在线人数为" + getOnlineCount());
    }
 
    /**
     * 收到客户端消息后调用的方法
     *
     * @param message 客户端发送过来的消息*/
    @OnMessage
    public void onMessage(String message, Session session) {
    	log.info("来自客户端的消息:" + message);
 
        //群发消息
//        for (WebSocketServer item : webSocketSet) {
//            try {
//                item.sendMessage(message);
//            } catch (IOException e) {
//                e.printStackTrace();
//            }
//        }
    }
 
	/**
	 * 
	 * @param session
	 * @param error
	 */
    @OnError
    public void onError(Session session, Throwable error) {
        log.error("发生错误");
        error.printStackTrace();
    }
 
 
    public void sendMessage(String message) throws IOException {
        this.session.getBasicRemote().sendText(message);
    }
 
 
    /**
     * 群发自定义消息
     * */
//    public static void sendInfo(String message) throws IOException {
//    	log.info(message);
//        for (WebSocketServer item : webSocket) {
//            try {
//                item.sendMessage(message);
//            } catch (IOException e) {
//                continue;
//            }
//        }
//    }
 
    public static synchronized int getOnlineCount() {
        return onlineCount;
    }
 
    public static synchronized void addOnlineCount() {
        WebSocketServer.onlineCount++;
    }
 
    public static synchronized void subOnlineCount() {
        WebSocketServer.onlineCount--;
    }

}
